No need to worry about data loss from corrupt files or other non-catastrophic failures. Old versions of your files are saved to prevent data loss. There are no limits enforced on how long you can keep the versioned backups.
Multiple people have expressed dissatisfaction with Crashplan's upload speed and the companies unwillingness to acknowledge the issue. It's become such a common complaint that there's a Twitter account that compiles tweets with people being frustrated with Crashplan's upload speeds.
The backup process can be canceled or it can automatically pause if it encounters an issue (like the destination not having enough space for the backup), but there's no way to pause the process manually.
Redo Backup and Recovery is not a program but a live CD, where it is run from an external disk or USB. It is built upon Ubuntu and works as an easy way to restore a drive even when the OS will not boot.
Due to the fact that this backup tool is launched from an external USB or CD there is no solution to do auto backups. Each one will have to be manually done, which is not always the easiest way to go about frequent backups.
The free version of the software allows backing up and recovering files, disks, partitions as well as system files. It supports incremental and differential backups, allows scheduling, can backup to a cloud and clone disks.